September weather forecast
Biha, Indonesia

September, the first month of the spring in Biha, is still a tropical month, with temperature in the range of an average low of 21.5°C (70.7°F) and an average high of 30.9°C (87.6°F).

Temperature

Shifting into September, Biha records an average high-temperature of a still hot 30.9°C (87.6°F), presenting minor fluctuations compared to the previous month. September nights are marked by an average low-temperature of 21.5°C (70.7°F).

Heat index

September's mean heat index is appraised at a scorching 41°C (105.8°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a single figure representing how weather conditions feel when combining temperature and humidity. The effect of weather is individual, with a variety of people experiencing it differently due to distinctions in body mass, height, and level of activity. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children frequently underestimate the necessity to rest and hydrate. Thirst is a late sign of dehydration - thus, it is vital to stay hydrated, particularly during lengthy physical exercises.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

September and October, with an average relative humidity of 80%, are the least humid months.

Rainfall

The month with the least rainfall is September, when the rain falls for 21 days and typically collects 81mm (3.19") of precipitation.

Sea temperature

The month with the coldest seawater is September, with an average sea temperature of 27.8°C (82°F).
Note: In any water activity, temperatures between 25°C (77°F) and 29°C (84.2°F) are viewed as magnificent and exceptionally pleasant for prolonged enjoyment.

Daylight

The average length of the day in September is 12h and 5min.
On the first day of September, sunrise is at 06:03 and sunset at 18:04. On the last day of the month, sunrise is at 05:49 and sunset at 17:58 WIB.

Sunshine

With an average of 8.6h of sunshine, September has the most sunshine of the year.

UV index

The months with the lowest UV index in Biha, Indonesia, are January, February, May through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the UV index of 6 transforms into the following advice:
Resist extreme sun exposure. Guarding against solar damage is essential. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Stay aware! UV radiation is magnified when reflecting off sand and water.